Alert archive / Ohio / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 331

May 25, 200238 counties in Ohio

The Storm Prediction Center issued this severe thunderstorm watch at May 25, 2002, 5:30 PM EDT for 38 counties in Ohio. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 25, 2002, 5:30 PM EDT (21:30 UTC)
Expired: May 25, 2002, 11:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 38 counties

Ashland County, OH, Champaign County, OH, Clark County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Erie County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Geauga County, OH, Greene County, OH, Hancock County, OH, Hardin County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Lake County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Madison County, OH, Marion County, OH, Medina County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Ottawa County, OH, Pickaway County, OH, Preble County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Summit County, OH, Union County, OH, Wayne County, OH, Wyandot County, OH

The radar

The Cincinnati radar (KILN), 123 km from the middle of the area, began a volume at 21:30 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 25, 5:47 PM EDT	Tornado Warning	CLE	Ottawa	28 min
May 25, 6:10 PM EDT	Severe Thunderstorm Warning	ILN	Darke, Shelby	50 min
May 25, 6:21 PM EDT	Severe Thunderstorm Warning	ILN	Preble	39 min
May 25, 8:02 PM EDT	Severe Thunderstorm Warning	CLE	Cuyahoga	43 min
May 25, 8:27 PM EDT	Severe Thunderstorm Warning	ILN	Clinton, Fayette, Greene	33 min
May 25, 8:35 PM EDT	Severe Thunderstorm Warning	CLE	Lake	40 min

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 9.5 hours before the alert went out and 121 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 38 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 677 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 252126
SEL1  
SPC WW 252122
OHZ000-LEZ000-260300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 331
STORM PREDICTION CENTER NORMAN OK
522 PM EDT SAT MAY 25 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   CENTRAL OHIO                               
   LAKE ERIE                          

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 530 PM UNTIL
1100 PM EDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES SOUTHEAST OF DAYTON OHIO TO
30 MILES NORTH NORTHWEST OF CLEVELAND OHIO.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 329...WW 330...

DISCUSSION...COMBINATION OF STRONG SHEAR...MODERATE INSTABILITY AND
CONVERGENCE ALONG APPROACHING COLD FRONT WILL SUPPORT A FEW SEVERE
THUNDERSTORMS ACROSS WW THIS EVENING.  LOW LEVEL SHEAR WILL REMAIN
SUPPORTIVE OF SUPERCELLS...PRIMARILY INVOF WARM FRONT ALONG THE SRN
SHORE OF LAKE ERIE...THOUGH MAIN SEVERE THREATS WILL BE LARGE HAIL
AND DAMAGING WINDS.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.  MEAN STORM
MOTION VECTOR 25040.

...EVANS

414,0805 393,0823 393,0845 414,0831

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 25, 2:45 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Auglaize, Darke, Defiance, Fulton, Henry and 8 more	5 hr
May 25, 6:15 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Butler, Clermont, Clinton, Fayette and 4 more	5 hr

Nearby

Severe Thunderstorm Watches in Ohio, 2002 Every severe thunderstorm watch in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.